I only show in CFA or ACFA. So I don't know the detailed stuff for TICA. However, I can give you basics for showing.
First get him used to being handled by a lot of people - like friends, etc. Practice stretching him out and holding in the air (one hand under the chest/front legs and the other just in front of the back legs. Practice making him stand on 2 back feet on the table. Practice having his head touched and face/muzzle "examined".
He should be comfortable with any position.
Now as far as grooming - I do hope you've groomed him many times so far - you need a comb (NOT a brush) and teach him to stand still while grooming head, body, tail, and tummy.
You will have to give him a bath before the show (probably 1 or 2 days before) - the ragdoll people will know better then me. All nails should be clipped and ears/eyes clean.
For show supplies you need towels or curtains to go on 3 sides of the cages (provided by the club) and a towel for the top, and one for the bottom. Bring an extra towel or two for any accidents. You need grooming supplies including combs, Q-tips, nail clippers, and a bit of cornstarch powder - takes the static out of the coat.
Good luck in showing him. The judges will let you know if he's worthy of further showing. If he's not top quality and will do well, you can always show him in the household pet section.